Pneumatic sheet feeder



e. 'spnsss PNEUMATIC SHEET FEEDER May 1, 1928. 1,668,292

Filed July 18, 1927 2 Sheets-Sheet 1 In van for: (I'm/y Spzhss Attorney. I I

May 1, 1928. 1,668,292

G. sPlEss PNEUMATIC SHEET FEEDER Filed July 18, 1927 2 Sheets-Sheet 2 All Patented May 1, 1928.

UNITED STATES I 1,668,292 PATENT OFFICE.

GEORG SPIESS, 0F LEIPZIG-I'LAGWITZ, GERMANY.

PNEUMATIC SHEET FEEDER.

Application filed July 18, 1927, Serial No. 206,654, and in Germany July 17, 1926.

used arrangements is however, that altera-' tion of the times at which controlling takes place is possible only by interchanging the control-valves so that consequently the workman who attends the machine, cannot regulate the control.

To avoid these inconveniences the distributing valves which liberate and shut-off the suction-and blowing-air, are controlled, ac-.

cording to the invention, by circulating cams. Bringing into register of the control-ports of the rotating valves with the control-ports of the stationany 'valve housings takes place consequently-"in jerks, and these ports remain registering when the rotary valve is at rest, until by the next following cam the position is suddenly altered. The control-ports of the valves need to he, therefore, only of small dimensions and the suction-or blowing-air is suddenly liberated. and shut-off in full strength.

The control cams, which control the distributing valves for the suction-air and for the blowing-air are adjustablyarranged so that the time, at which the blowing-or suction-air is's'hut oil, can be altered at will. This is specially advantageous as it might be necessary to make the suction-air and accordingly also, the blowing-air, enter into function sooner or later. The control cams are preferably adjustably arranged on a common control-shaft and displaced in axial direction in such a manner that the controlcam for the suction-air cooperates only with the distributing valve for the suction-air, thecontrol-cam for the blowing-air cooperating only with the distributing valve for the blowing air. With this object in view the control-cams for the suction-air are respectively arranged on the front side and those for the blowing air on the rear side ,of a disk comprising fixation-and adjusting slots. On the same cam-shaft the driving .mechanism is arranged.

The rotary valves for distributing the blowing air and suctionair are connected, according to the invention, to a common blower which supplies the suction-and blowing air and. is adapted to be brought by the valves into communication with the atmosphere, according to the requirements. Rotary blowers have already been used in connection with pneumatic-sheet-feeding mechanisms, but either for the production of the suction air or for the production of the blowing air.

An embodiment of the invention is shown, by way of example, imthe accompanying draw ng in Wl'11ChI-- Fig. 1 shows the total arrangement in side elevation.

Fig. 2 shows on larger scale in longitudinal section a distributing slide valve.

Figs. 3 and 4 show each a cross section of the distributing slide valve in different positions.

Figs. 5 and 6 show respectively in elevation and in top plan view the arrangement 4 a pressure-pipe 4 are attached to the suctionand pressure-ports respectively of said blower. The otherend of the suction-pipe 3 is mounted on a nipple 5 of a valve-housing 6,

fixed at a suitable point on the machineframe 7. This housing (i has other nipples 8 from which tubes ,9 lead to the different connection-points 10 of-the suction-elements. In the housing 6 a tubular valve 11 is rotatably mounted which has control-ports 12. The control-ports 12 are so arranged that alternately the tubes 3 and 9 are made to communicate the one with the other or are shut 011' the one from the other after every quarter rotation of the rotary valve.

On the projecting end of an extension 13 of the rotary valve a control wheel or member 14 is keyed which-carries a roller 15 at the end'of each of its four arms and which is rotated each time 90 by a cam 17 fixed on a s ur-wheel 16. The spur-wheel 16 is rotate through the intermediary of a gear wheel 18 from a spur-wheel 20, keyed on a.

' shaft The spur-wheel 16 has two cams 4 l7 WlllCh are arranged in such a manner 'zles. The wheel 23 of the rotary valve for the blowing air is controlledby two cams 24 on the toothed wheel 20 in a similar man-.2

ner as the rotary valve for thcsuction-air.

Fig. 1 shows the elements in the position shortly before the lifting of a sheet. The sucker 25 rests already upon the to a-shcet of the pile 26. The one cam 24 wil, shortly after this position, rotate the wheel 23 of the valve in the blowing air-conduit so that the-communication between the elements 4 and 22 of this conduit is established, and the one cam 17 of the spur wheel 16'will, immediately after'this, rotate the wheel 14 of the suction-air-conduit so that the communi' cation between the two conduit-elements 3 and 9 is established. When the top-sheet has been lifted from the pile, the two other earns 22, 17 respectively shut off the communication between the blower p, and the blowing nozzles or suckers respectively.

In the form of construction illustrated in Figs. 5 and 6 the control-cams for the suction'air and for the blowing air are adjustably "mounted on a common disk 28,

which is provided with slots. 27 receiving bolts or like fastenings securing the cams 17 and 24 thereto, the cams 24 controlling the blowing air being arranged'on the front side of the disk, while the cams 17 control-' ling the suction-air are mounted on the rear side of saiddisk, i. e., said cams are thus being disposed to operate in different rotary paths. The control wheels 14 and 23 respectively of the valves for the suction-air and for the blowing air are arranged so as to lie in the rotary paths of the cams 17 and 24 so as to be properly operated thereby.

A lifting cam 29 is further connected with 1 ,ees,292

the disk 28 or keyed on the same shaft, said lifting cam 29 operating, by means of levers 30, 3'1, 32, the ratchet feed-gears 33, 34 which drive the conveying spindles 36 of the piletable. All the control-elements, including the corresponding control-rigging, are arranged on that side of the machine on which the attendant stands so that they are easily accessible and may be adjusted I; claim 1. A pneumatic sheet-feeding mechanism for printing-presses, folding machines and the like, comprising in combination rotary valves for the suction air and for the blowing air, and cams for controlling said rotary valves. p

2. In a pneumatic sheet-feeding mechanism as specified in claim'l, a rotary-blower. for producing thesucking tension and the blowing air. I I

3. In a pneumatic sheet-feeding mechw nism as specified in claim 1, in combination with" the rotary valves for the suction air and for the blowing air and with the ,con trolling cams, a common shaft for said cams on which said cams are mounted displaced the one to the other in axial direction.

4. In a pneumatic sheet-feeding mechanism as specified in claim 1, in combination with the rotary valves for the suction air and for the blowing air and with the controlling cams, a common shaft for said cams, a disk keyed on said shaft, and means for. adjustably fixing on said disk the controlcams for the suction-air on one side of said disk and. the control cams for the blowing air on the other side of said disk.

5. In a pneumatic sheet-feeding mechanism as specified in claim 1, in combination with the-rotary distributing valves for the suction .air and for the blowing air and with the control cams, a common shaft for said cams on which said cams are mounted displaced the one to the other in axial direction, a pile-table, conveying spindles for said pile-table, a feedgear for driving said conveying spindles, and a driving cam for said feed shaft.

In testimony whereof I aflix my signature. GEOR G SPIESS.

gear and keyed on said common' 

